Independent Component Analysis for Passive Sonar Signal Processing
Natanael Nunes de Moura, E. Furtado De Simas Filho, Jos Manoel de Seixas · 2009
A passive sonar system performs detection and estimation using the noise irradiated by the target itself (Nielsen, 1991) (Clay & Medwin, 1998), (Jeffsers et al., 2000).The major difficulty in passive sonar systems is to detect the target in huge background noise environments.As much in active and passive mode, the sonar operator, (SO) listens to the received signal from one given direction, selected during the beamforming, envisaging target identification.This chapter focus on passive sonar systems and how the received noise is analysed that may arise.In particular, the signal interference in neighbour directions is discussed.Envisaging interference removal, Independent Component Analysis (ICA) (Hyvärinen, 2000) is introduce and recent results obtained from experimental data are described.The chapter is organised as it follows.In next Section, the analysis performed by passive sonar systems is detailed described.Section 3 introduces ICA principles and algorithms.Section 4 shows how ICA may be applied for interference removal.Finally, a chapter summary and perspectives of passive sonar signal processing are addressed in Section 5.